2 * linux/arch/arm/mach-pxa/pxa25x.c
4 * Author: Nicolas Pitre
5 * Created: Jun 15, 2001
6 * Copyright: MontaVista Software Inc.
8 * Code specific to PXA21x/25x/26x variants.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 * Since this file should be linked before any other machine specific file,
15 * the __initcall() here will be executed first. This serves as default
16 * initialization stuff for PXA machines which can be overridden later if
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23 #include <linux/suspend.h>
24 #include <linux/sysdev.h>
26 #include <asm/hardware.h>
27 #include <asm/arch/irqs.h>
28 #include <asm/arch/pxa-regs.h>
29 #include <asm/arch/pxa2xx-regs.h>
30 #include <asm/arch/mfp-pxa25x.h>
31 #include <asm/arch/pm.h>
32 #include <asm/arch/dma.h>
39 * Various clock factors driven by the CCCR register.
42 /* Crystal Frequency to Memory Frequency Multiplier (L) */
43 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
45 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
46 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
48 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
49 /* Note: we store the value N * 2 here. */
50 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
53 #define BASE_CLK 3686400
56 * Get the clock frequency as reflected by CCCR and the turbo flag.
57 * We assume these values have been applied via a fcs.
58 * If info is not 0 we also display the current settings.
60 unsigned int pxa25x_get_clk_frequency_khz(int info)
62 unsigned long cccr, turbo;
63 unsigned int l, L, m, M, n2, N;
66 asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
68 l = L_clk_mult[(cccr >> 0) & 0x1f];
69 m = M_clk_mult[(cccr >> 5) & 0x03];
70 n2 = N2_clk_mult[(cccr >> 7) & 0x07];
79 printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
80 L / 1000000, (L % 1000000) / 10000, l );
82 printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
83 M / 1000000, (M % 1000000) / 10000, m );
85 printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
86 N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
87 (turbo & 1) ? "" : "in" );
90 return (turbo & 1) ? (N/1000) : (M/1000);
94 * Return the current memory clock frequency in units of 10kHz
96 unsigned int pxa25x_get_memclk_frequency_10khz(void)
98 return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
101 static unsigned long clk_pxa25x_lcd_getrate(struct clk *clk)
103 return pxa25x_get_memclk_frequency_10khz() * 10000;
106 static const struct clkops clk_pxa25x_lcd_ops = {
107 .enable = clk_cken_enable,
108 .disable = clk_cken_disable,
109 .getrate = clk_pxa25x_lcd_getrate,
113 * 3.6864MHz -> OST, GPIO, SSP, PWM, PLLs (95.842MHz, 147.456MHz)
114 * 95.842MHz -> MMC 19.169MHz, I2C 31.949MHz, FICP 47.923MHz, USB 47.923MHz
115 * 147.456MHz -> UART 14.7456MHz, AC97 12.288MHz, I2S 5.672MHz (allegedly)
117 static struct clk pxa25x_hwuart_clk =
118 INIT_CKEN("UARTCLK", HWUART, 14745600, 1, &pxa_device_hwuart.dev)
122 * PXA 2xx clock declarations. Order is important (see aliases below)
123 * Please be careful not to disrupt the ordering.
125 static struct clk pxa25x_clks[] = {
126 INIT_CK("LCDCLK", LCD, &clk_pxa25x_lcd_ops, &pxa_device_fb.dev),
127 INIT_CKEN("UARTCLK", FFUART, 14745600, 1, &pxa_device_ffuart.dev),
128 INIT_CKEN("UARTCLK", BTUART, 14745600, 1, &pxa_device_btuart.dev),
129 INIT_CKEN("UARTCLK", STUART, 14745600, 1, NULL),
130 INIT_CKEN("UDCCLK", USB, 47923000, 5, &pxa25x_device_udc.dev),
131 INIT_CKEN("MMCCLK", MMC, 19169000, 0, &pxa_device_mci.dev),
132 INIT_CKEN("I2CCLK", I2C, 31949000, 0, &pxa_device_i2c.dev),
134 INIT_CKEN("SSPCLK", SSP, 3686400, 0, &pxa25x_device_ssp.dev),
135 INIT_CKEN("SSPCLK", NSSP, 3686400, 0, &pxa25x_device_nssp.dev),
136 INIT_CKEN("SSPCLK", ASSP, 3686400, 0, &pxa25x_device_assp.dev),
137 INIT_CKEN("PWMCLK", PWM0, 3686400, 0, &pxa25x_device_pwm0.dev),
138 INIT_CKEN("PWMCLK", PWM1, 3686400, 0, &pxa25x_device_pwm1.dev),
140 INIT_CKEN("AC97CLK", AC97, 24576000, 0, NULL),
143 INIT_CKEN("I2SCLK", I2S, 14745600, 0, NULL),
145 INIT_CKEN("FICPCLK", FICP, 47923000, 0, NULL),
148 static struct clk gpio7_clk = INIT_CKOTHER("GPIO7_CK", &pxa25x_clks[4], NULL);
152 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
153 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
156 * List of global PXA peripheral registers to preserve.
157 * More ones like CP and general purpose register values are preserved
158 * with the stack pointer in sleep.S.
160 enum { SLEEP_SAVE_PGSR0, SLEEP_SAVE_PGSR1, SLEEP_SAVE_PGSR2,
162 SLEEP_SAVE_GAFR0_L, SLEEP_SAVE_GAFR0_U,
163 SLEEP_SAVE_GAFR1_L, SLEEP_SAVE_GAFR1_U,
164 SLEEP_SAVE_GAFR2_L, SLEEP_SAVE_GAFR2_U,
174 static void pxa25x_cpu_pm_save(unsigned long *sleep_save)
176 SAVE(PGSR0); SAVE(PGSR1); SAVE(PGSR2);
178 SAVE(GAFR0_L); SAVE(GAFR0_U);
179 SAVE(GAFR1_L); SAVE(GAFR1_U);
180 SAVE(GAFR2_L); SAVE(GAFR2_U);
185 /* Clear GPIO transition detect bits */
186 GEDR0 = GEDR0; GEDR1 = GEDR1; GEDR2 = GEDR2;
189 static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
191 /* ensure not to come back here if it wasn't intended */
194 /* restore registers */
195 RESTORE(GAFR0_L); RESTORE(GAFR0_U);
196 RESTORE(GAFR1_L); RESTORE(GAFR1_U);
197 RESTORE(GAFR2_L); RESTORE(GAFR2_U);
198 RESTORE(PGSR0); RESTORE(PGSR1); RESTORE(PGSR2);
200 PSSR = PSSR_RDH | PSSR_PH;
206 static void pxa25x_cpu_pm_enter(suspend_state_t state)
208 /* Clear reset status */
209 RCSR = RCSR_HWR | RCSR_WDR | RCSR_SMR | RCSR_GPR;
213 /* set resume return address */
214 PSPR = virt_to_phys(pxa_cpu_resume);
215 pxa25x_cpu_suspend(PWRMODE_SLEEP);
220 static struct pxa_cpu_pm_fns pxa25x_cpu_pm_fns = {
221 .save_count = SLEEP_SAVE_COUNT,
222 .valid = suspend_valid_only_mem,
223 .save = pxa25x_cpu_pm_save,
224 .restore = pxa25x_cpu_pm_restore,
225 .enter = pxa25x_cpu_pm_enter,
228 static void __init pxa25x_init_pm(void)
230 pxa_cpu_pm_fns = &pxa25x_cpu_pm_fns;
233 static inline void pxa25x_init_pm(void) {}
236 /* PXA25x: supports wakeup from GPIO0..GPIO15 and RTC alarm
239 static int pxa25x_set_wake(unsigned int irq, unsigned int on)
241 int gpio = IRQ_TO_GPIO(irq);
244 if (gpio >= 0 && gpio < 85)
245 return gpio_set_wake(gpio, on);
247 if (irq == IRQ_RTCAlrm) {
263 void __init pxa25x_init_irq(void)
265 pxa_init_irq(32, pxa25x_set_wake);
266 pxa_init_gpio(85, pxa25x_set_wake);
269 static struct platform_device *pxa25x_devices[] __initdata = {
283 static struct sys_device pxa25x_sysdev[] = {
285 .cls = &pxa_irq_sysclass,
287 .cls = &pxa_gpio_sysclass,
291 static int __init pxa25x_init(void)
295 /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
297 clks_register(&pxa25x_hwuart_clk, 1);
299 if (cpu_is_pxa21x() || cpu_is_pxa25x()) {
300 clks_register(pxa25x_clks, ARRAY_SIZE(pxa25x_clks));
302 if ((ret = pxa_init_dma(16)))
307 for (i = 0; i < ARRAY_SIZE(pxa25x_sysdev); i++) {
308 ret = sysdev_register(&pxa25x_sysdev[i]);
310 pr_err("failed to register sysdev[%d]\n", i);
313 ret = platform_add_devices(pxa25x_devices,
314 ARRAY_SIZE(pxa25x_devices));
319 /* Only add HWUART for PXA255/26x; PXA210/250/27x do not have it. */
321 ret = platform_device_register(&pxa_device_hwuart);
323 clks_register(&gpio7_clk, 1);
328 postcore_initcall(pxa25x_init);